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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ec3c7d1884a3fc40bd832b70f97c7dbe3d5bc4b6a8c005d02edac235f23686' 
  AND token = 'LhgDahAPcUZ4GiV5Q8LW30PrKetNBOjuGelXHqAvdsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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