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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4543e462d6644362c10578939ef308053ebc4046b859b2c684a2e449cd10d1' 
  AND token = 'nzb+VA3fxM4BIFxja927DOkeFAuT1LYt1Ar2LJQtG8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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