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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df98be421a87d1c8f3d4aa226ee871f2ea6c27bb8f42464a553a8f661d18efd5' 
  AND token = '2SPThQnDaTz/Ju7qvRutQ0uF4lFa7hqcYrTrYW9vsnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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