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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eeb23ce9f14e07471669d4ec594e27561b31b7b1d670157ae77e0771a1f4773' 
  AND token = 'pCA72ubunp3LQHes9BbR2pwkHj6DFkqWTyEUrcndVxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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