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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04a35a7fd5f16a79363213a57bc8afe898f0e9012a6826e85946833cf1d6a8e' 
  AND token = 'PmhnQFP2uHl/9IlXx8VQfmNjKsr94O1nMHk7oTX83wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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