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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df17681344ad2753b29c835e062b5bda10b254d2da0f2b1fc59c73bac85cbec7' 
  AND token = 'jA52pWW9TFmZHOekDxs3xUSwM3Hpec0CSfZbQQHr63M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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