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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847473e1f43ac11df2fee96ae3c8a7d598903279840ad9b86b8f2124a87dce53' 
  AND token = 'j7yi4rtd+OG7S3td6hzJh8tecCHjcO3mjtCP/LVkdDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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