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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc167999426b7f3bdb14759db6e0ed516efef37eb7b6229e486e307f9b773f1' 
  AND token = 'qySAQCW7JajVHul39hH0bOXomjoaUONpPxhQ7Wgervc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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