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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7813a6e0a6206cd55680d0f6acc71bc14751a23037e8e31e26cf5ffb3a34dcf1' 
  AND token = 'xmH6y8CaYPOEWWgUqQpZkbQ235evmYCd/s9tvgilmcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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