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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833dbe98992e8f4886f42e5ea901ba10c1e2afec887983b767e9a5b536e53a38' 
  AND token = 'dyLN4uG6K2dZPoufvECPJYcx7aW2i8yrIZhr62z+n7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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