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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cae8129aa633bb195a7a71dbdc2cc62842ff1bac47023b22695c987a64a513' 
  AND token = '2a58BV+qe3BfAwgUeaIJZ+U6+euI80zElgoZvWBQaYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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