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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1feef1b5c28219909c0b104d8fcf1e4d36450a1ebc118612e5c4274e19e8dd11' 
  AND token = '+BfiVs2tdySENdi0K5zL/GJjilkGOsAgjh/YAn4k3xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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