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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccae55e774ca0b846c68de6035ce1ce41c516a42d4c248444a260ab8414c8372' 
  AND token = '2RL7awwEfvK//O4fP/SBjryFHfmUogiVM9cAkbVIjEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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