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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d8b14984c3960c959306a5ffc13b49159d1750421594cb3b983df4f86ee733' 
  AND token = 'L1Mo8v8hNogcHOSEcjTwo6L4Jrw20bq2cNiKevt0wb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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