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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b2961867a7a33b45b10c1f62e0ed7f81b454b0e8885fef88f1112898cde91d' 
  AND token = 'S6DcmY2kj63KdP7FOPiLPr/P9hjTjQnY29BAbCW3Wrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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