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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190b10c09288654d1ea78b7340970d9123ef780872b6c2b85949be7120be38a1' 
  AND token = 'ih+fBgY/fgyWdaRhZZY4FnlFAKt1Qu0cXDst3R96xZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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