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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adf016cc90226701dbb416e3ab1e8dbfa938bc02c44fd5ff4ebc4229eb08e3e' 
  AND token = 'fpzLy7kXp6ww+epwdSsueuHKNqZ1Rql1GHHD14z0AYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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