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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ca3097e688160f7ce54ff3b93082215ea6070305360c13fdcdbf521e45bc05' 
  AND token = 'X6Rd/cvi7SdQszwk66zDrjtv0Q4W2rxthsFNk5wyCvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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