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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3850c046aa9cab9ae8582368a5c78b86d7cd142b6698b9a5eedd90cbf64f238b' 
  AND token = 'eKmHAv8RIZEkJc3oYy3YyfvK7jwgMlgeuSbWm+/1ikQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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