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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fddec06f86d6c6d2fbaef0451e3bb249f8c626f9aea5659967c84e62e3a12a' 
  AND token = '9lMn0q9AKQ7k24B+VjlhNu/Er/b6g4jbMK0qDmhruAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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