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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a8579539f15c0e3d87efb7e4b1e5fe591d4482049aacd4fd555ad7f7c7a72f' 
  AND token = '0DuB8ci/mw6ynYL+aZtLK/rfbLJHudqbYj1OXF/YJ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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