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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd82c6555b289a183b1e66b94e59e2b87ff2d6861b0bff2f73c8cf6f1277ac1' 
  AND token = '/wn95gF+c4feC7poNmcVW9vuvy+zxyfaN4zjLRw3/io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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