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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73eb14e4cc7acb5bf6d3e2335a05b377e33c858fe2b7fc0f5a7a02ff6f302faa' 
  AND token = 'jCht1SEGOnCYGBU0vlV2ucmUiQbvc/3zI2wFAbE9Wgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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