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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3051c557e0324556371989855457c33fc962f6ffb0880484cd9477c6f706b67d' 
  AND token = '18pa+6YW1MqFN8CuNh1/ZRFNau518SnZMcE21AQ6OB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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