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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48e236de6b55588a353d944df0892e5253efae9297d2c174a669355443a8966' 
  AND token = 'TlhPLHcoXkHjofzOBtUUehm8Nz3UuCfNc+5GoZooaDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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