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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b540dc2047d5fda54261af458e9b31c8fe1e1e4e55ad36f1ce079427d93292ab' 
  AND token = 'IQi1lAfAmnB59kjrHy/xFkAPKVqbhHZvad5F9x0Os9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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