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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b52ad93b551f52f1d7478da4ad7d74913ffb3d1da515ca0f44a77413248e80' 
  AND token = 'qaeKmUfmQ/pzn85FJQBzplc/sGG/ecTJXesyL62xJII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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