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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3eabe2f1119d623d673ab4064f758c4cb40003074335d5ca7989d0869932957' 
  AND token = 'ykOo2NFxa88cPGmZtH63nCoD/JGykd11xgZ3LomM1xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}