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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33cf26ed678b4a6932b2606e885b0cd85479efa140a34a0a9c5c7d0f206b55d2' 
  AND token = '/Pxov7H+d+hZlXbXrr735mqcq406PeOofM2GpmaDjuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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