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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca224841a31ffd185f79b8729cd15063c72831ca3d241fdaff343ccd597a79d' 
  AND token = '2Qp0LevNgIo1/gGBFUIva9k5S18n7guaMIUoCAUq1mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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