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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f459984f7b8eac323b31f896610e24f62c1d5e4445096465a50b53ba0bfcda5' 
  AND token = '+4pGAQ4WPoQzovrPRP5fzIQZyc9DoUY1US18GwveUDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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