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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b5d9ee886b699bab7c00d3bd8383f0e5cdc0c449a16bdcaa257ea2dfe6285f' 
  AND token = 'QBTY4adCF3udOQuUl/tmKU61kR6wAzlctpsMV84teyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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