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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7912ddb7cee25bae3592cb0163668266dc530b6d86c29b672fea8427428949b' 
  AND token = '+/k6F2lc9CmEzaLVwn0KlLutfWEK0MIPCt9ke5IQx3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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