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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b0fca7a6f325bfc943d1d3554408ce3c7a0cb6605833d39fda104d7c87588e' 
  AND token = 'zpEpFv13+xyuKDxodOdnIxFuTi+IIH5jlUUDE1i9Syw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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