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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2eb60a823fe3740ade92e606ef0896c87a777fa74fb3cfc67e9b6f72585d08' 
  AND token = 'Qe5v7op20Qi+9572ADUFFQf9e+zqOREKyZax2pn9xOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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