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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34f4b3658d392eb907cd886eeb3d2af59ac45ecf7e3ffb86aef8930f5358795' 
  AND token = 'dY+a/iHRqETvrD2RZ8E9z8/uTIGVyp+tx6x9C/j8Rhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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