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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f0b4d990646b91d347deb355ea25dacd36f46dd407d5c1a88f914e5f98a5eb' 
  AND token = 'BZbLfNyKHTF7pUQYne4KA3+ZgmbF4eMy+dXHj+QJris=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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