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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4937a876f6ab59a8efc62cb094327572d59f3a0607f08eccc3155fa9973c72ab' 
  AND token = 'V2BA2W4OE58aJW3GUqqRPV8mHS04eabluyzVm7y2US0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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