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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833c5c1a39d627dbe09628237c89fb150c7c5c6617aba7192128b0d59c7127e1' 
  AND token = 'y3t6KopQ6u1LTFty9n5q0UIVtqYwH12FwjnjshC/FsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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