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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aace78d5935ad7be59bd5399d98f1b10358790ab9decf2a3c9f87906b2ee049' 
  AND token = 'uPq5eXc80l0P6T/zJDWzUYGIbFdy4x2htty6Ols8VQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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