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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6965f62ec226a740094cf6bd58e449fe2d954dd2c92bd07ec1be9d6262efd8c' 
  AND token = 'byi60KBDQG8AR/avC5JJhbtOain+FfLbi+8k2gnrMT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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