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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd831835ba4ec32405041e27779bdac2440982b40943a8b130379ca1dbb117588' 
  AND token = 'zjZn5Awa/y8tHXvCzzKzRQg04YVnsLCpE7C34XNLibU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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