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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36450c564621dd5571147113c81135e1ce7181c5b7bef673078708fa1879b49e' 
  AND token = 'hf19T4HWQvHLmq66IuSK0FMpPmWQqs/QV8w5QXAV8/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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