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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c64d4ef3e1b1a909065d97f506a53cf7b6a28333b892fa634c6b1e19939a608' 
  AND token = '4vfpN1KwG/zRpXfICODlULXx6C1FKZaOlCjRo0+A1Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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