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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71d74e54da8e22b66c04316c3036e03834155231878a784c6c5240506c27cad' 
  AND token = 'icBmmrSdGl49TTGCIsLyPpOMecoqi46cd+ZzNLqNnwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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