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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb780cc98c21c751863381e9e6c7b15ea0d035435bf5f88d72419b2a764ba076' 
  AND token = 'cTp36a4vXDw6qnKqzTRMoZhC4cFKJ2vQqWKTC7IXaoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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