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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee3db21c67394827f9884cfaf4f63ebe0fb7ec93363429f00b3f2359219d513' 
  AND token = 'ODpxLSqQ23LVHH9GLM9md92g5XZxn1oID3mZzOAQccE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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