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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a80b0c862712d8d042275faf9972ba0a4bb845fb122bd13a6c2a071572c8d17b' 
  AND token = '/vW7E2TSNuDG4aklHrV5sRn/FeTjlCuRZzNcvmdY0qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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