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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a9804b92a206571075b6a97eaf376a18bf69b3d64ba64e6fb9f8b66f02949d' 
  AND token = '1NZf7R6AZYUxFKTm2XbiLceRX/iLk8v/Jnwz0QEGst4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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