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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3e6430407e1f43d6c8059c4eef53c8dc67b6feb3ab34e5f22f4b8febe0ca3f' 
  AND token = 'gea3AvCf4sTGZzZ+ERTETgHKMsCvZHoPigt+7RtaZK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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