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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8206fccfe96aacd62c76265bfef22bb9607da0e11f60a978f742350e1c100c' 
  AND token = '0OIt9MXbjrpxBp5ARIZsKW7ckKmgI+I3FYeTFlLwof4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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