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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775d7a3ecaf9bf8247950b226d22b2ad6b8e1e1ccadea6df7c4a75c5584215e0' 
  AND token = 'KGeGp1tt0zkTUV6Tni38UVcDvhdzOnhioB7yjsJIwSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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