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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4fadf468346d4986f3af6bc98b5c19059989cf9bf813270c22b5253f5e64d60' 
  AND token = '9EVM0LfDZOjGyPvjoEe0HjHsJwsndYkVrzhE5eP3QlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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