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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f53f3c2a5c8cc4e3c116806629d315eb56b320abfb6849d95d94ba88ea65b8' 
  AND token = '/qBnrEne5e9lseApVXJ55WXgZDIR2X0lycEAUaPX+lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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