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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ba4f2a370789d399a15533e265475221f3b33470e2582c695787fedac653b3' 
  AND token = '7Hvb2JfnT/6J9LZRlpTbkc5GplTrPEkVtP2LjEOoTgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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