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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d277c90526cb9b20e0e360cd91a10fae3187d3c77e0fdf53eae80e18772fb64' 
  AND token = '6LFB5cZhtpfO+VF/cXu67L+zejL7eMJIFTOjroBDbUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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