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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1656d80c9ebfe7f7df013105b7235b8d6c57aea07569684f05d744f3ae6a671' 
  AND token = 'NaSQcFmBd3bqj3iY0/EV6GsA0cCL3m8QZ547+L+kZdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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