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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd990e7b07f0724e6f4fc43e67f1a48b6e9edc8072d3978905bc4fb0677a3f567' 
  AND token = 'EwywrSpkqhc2TFP+Yr37/6Noz0WH6+F8jI83D7fSb8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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