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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835da857085995843b3a6c4113d87403f73898db4d94bfec4a82c67d2ced31c6' 
  AND token = 'kZ8YaRQjVMxOpfgceWbB9Hekll96fQYkr5Jo7r7yccg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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